[Zope-dev] ZODB object upgrades

[alan milligan]

Hi,

Over the last month or so, I've rather wonderfully managed to corrupt my 
ZODB with artifacts of my Currency class that no longer exist.

This is due to:
(i) moving the module to a different package (twice)
(ii) renaming the module
(iii) changing it's inheritance hierarchy (having removed all Zope-awareness 
from class has caused loads of setstate issues in regard to either 
__basicnew__ not found, AttributeErrors, and problems with non-derivation 
from AcquireImplicitWrapper)

I now desperately need to write a parser to convert all of these nasties to 
ZCurrency types.   I've come up with the following ExternalMethod - whereby 
I've defined a __currency__ attribute in each obselete incantation's product 
(Currency object's are used in the spirit of DateTime rather than within 
ObjectManager containment structures):

from Acquisition import aq_base
from Products.BastionBanking.ZCurrency import ZCurrency

def repair(container, counter=0):
    for (k,v) in container.__dict__.items():
        if hasattr(v, '__currency__'):
            setattr(container, k, ZCurrency(v._currency, v._amount))
            counter += 1

    for object in container.objectValues():
        for (k,v) in object.__dict__.items():
            if  hasattr(v, '__currency__'):
                setattr(object, k, ZCurrency(v._currency, v._amount))
                counter += 1
        if hasattr(aq_base(object), 'objectValues'):
            repair(object, counter)
    return counter


However, it doesn't seem to find anything to convert.  Does anyone have any 
ideas?

TIA, Alan

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